| Parameter |
Value |
| Designation |
C/2015 D5 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-04-17T01:46:07.006080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:07Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-03-06.0000000 |
| e |
0.49964849 |
| q (au) |
4.577343 |
| a (au) |
9.148254 |
| i (deg) |
20.399803 |
| Ω (om, deg) |
74.578267 |
| ω (w, deg) |
40.175332 |
| M (ma, deg) |
11.502709 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.465 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.465 |
| n |
2.000 |
| gf |
0.872 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
6.948 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
19:29:51.20 |
-33:25:13.4 |
HIP 95948 |
22.85 |
| 2026-05-12 12:00 |
19:29:47.95 |
-33:25:51.5 |
HIP 95948 |
22.63 |
| 2026-05-13 00:00 |
19:29:44.62 |
-33:26:29.7 |
HIP 95948 |
22.46 |
| 2026-05-13 12:00 |
19:29:41.20 |
-33:27:07.9 |
HIP 95948 |
22.33 |
| 2026-05-14 00:00 |
19:29:37.70 |
-33:27:46.2 |
HIP 95948 |
22.26 |
| 2026-05-14 12:00 |
19:29:34.11 |
-33:28:24.5 |
HIP 95948 |
22.24 |
| 2026-05-15 00:00 |
19:29:30.44 |
-33:29:02.9 |
HIP 95948 |
22.27 |
| 2026-05-15 12:00 |
19:29:26.69 |
-33:29:41.4 |
HIP 95948 |
22.36 |
| 2026-05-16 00:00 |
19:29:22.85 |
-33:30:19.9 |
HIP 95948 |
22.51 |
| 2026-05-16 12:00 |
19:29:18.93 |
-33:30:58.4 |
HIP 95948 |
22.71 |
| 2026-05-17 00:00 |
19:29:14.93 |
-33:31:37.0 |
HIP 95948 |
22.97 |
| 2026-05-17 12:00 |
19:29:10.85 |
-33:32:15.6 |
HIP 95948 |
23.29 |
| 2026-05-18 00:00 |
19:29:06.69 |
-33:32:54.2 |
HIP 95948 |
23.67 |
| 2026-05-18 12:00 |
19:29:02.44 |
-33:33:32.9 |
HIP 95948 |
24.11 |
| 2026-05-19 00:00 |
19:28:58.11 |
-33:34:11.6 |
HIP 95948 |
24.60 |
| 2026-05-19 12:00 |
19:28:53.71 |
-33:34:50.3 |
HIP 95948 |
25.14 |
| 2026-05-20 00:00 |
19:28:49.22 |
-33:35:29.1 |
HIP 95948 |
25.74 |
| 2026-05-20 12:00 |
19:28:44.66 |
-33:36:07.8 |
HIP 95948 |
26.39 |
| 2026-05-21 00:00 |
19:28:40.01 |
-33:36:46.6 |
HIP 95948 |
27.09 |
| 2026-05-21 12:00 |
19:28:35.29 |
-33:37:25.4 |
HIP 95948 |
27.83 |
| 2026-05-22 00:00 |
19:28:30.49 |
-33:38:04.1 |
HIP 95948 |
28.62 |
| 2026-05-22 12:00 |
19:28:25.61 |
-33:38:42.9 |
HIP 95948 |
29.45 |
| 2026-05-23 00:00 |
19:28:20.66 |
-33:39:21.7 |
HIP 95948 |
30.32 |
| 2026-05-23 12:00 |
19:28:15.63 |
-33:40:00.5 |
HIP 95948 |
31.23 |
| 2026-05-24 00:00 |
19:28:10.52 |
-33:40:39.2 |
HIP 95613 |
31.11 |
| 2026-05-24 12:00 |
19:28:05.34 |
-33:41:18.0 |
HIP 95613 |
29.99 |
| 2026-05-25 00:00 |
19:28:00.08 |
-33:41:56.7 |
HIP 95613 |
28.87 |
| 2026-05-25 12:00 |
19:27:54.75 |
-33:42:35.4 |
HIP 95613 |
27.76 |
| 2026-05-26 00:00 |
19:27:49.35 |
-33:43:14.1 |
HIP 95613 |
26.65 |
| 2026-05-26 12:00 |
19:27:43.87 |
-33:43:52.8 |
HIP 95613 |
25.56 |
| 2026-05-27 00:00 |
19:27:38.32 |
-33:44:31.4 |
HIP 95613 |
24.48 |
| 2026-05-27 12:00 |
19:27:32.70 |
-33:45:10.0 |
HIP 95613 |
23.43 |
| 2026-05-28 00:00 |
19:27:27.00 |
-33:45:48.6 |
HIP 95613 |
22.39 |
| 2026-05-28 12:00 |
19:27:21.24 |
-33:46:27.1 |
HIP 95613 |
21.39 |
| 2026-05-29 00:00 |
19:27:15.40 |
-33:47:05.6 |
HIP 95613 |
20.43 |
| 2026-05-29 12:00 |
19:27:09.49 |
-33:47:44.0 |
HIP 95613 |
19.51 |
| 2026-05-30 00:00 |
19:27:03.52 |
-33:48:22.4 |
HIP 95613 |
18.65 |
| 2026-05-30 12:00 |
19:26:57.47 |
-33:49:00.7 |
HIP 95613 |
17.86 |
| 2026-05-31 00:00 |
19:26:51.36 |
-33:49:39.0 |
HIP 95553 |
16.74 |
| 2026-05-31 12:00 |
19:26:45.18 |
-33:50:17.2 |
HIP 95553 |
15.52 |
| 2026-06-01 00:00 |
19:26:38.93 |
-33:50:55.3 |
HIP 95553 |
14.34 |
| 2026-06-01 12:00 |
19:26:32.61 |
-33:51:33.4 |
HIP 95553 |
13.20 |
| 2026-06-02 00:00 |
19:26:26.23 |
-33:52:11.4 |
HIP 95553 |
12.12 |